nationalityna‧tion‧al‧i‧ty /ˌnæʃəˈnæləti/ ●●○ noun (plural nationalities)1[countable, uncountable]PGC the state of being legally a citizen of a particular country → citizenshippeople of the same nationalityFrench/Brazilian etc nationalityHe has British nationality.dual nationality (=the state of being a citizen of two countries)2[countable]SAN a large group of people with the same race, origin, language etcthe different nationalities within the former USSR